<template>
  <view>
    <view>
      <!-- 使用自定义的搜索组件 -->
      <my-search @click.native="handleClick"></my-search>
      <view class="scroll-view-container">
        <!-- 左侧的滚动视图区域 -->
        <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
          <!-- 一级分类 -->
          <view class="left-scroll-view-item " :class="{active:index===active}" v-for="(item,index) in cateList"
            :key="index" @click="activechanged(index)">{{item.cat_name}}</view>
        </scroll-view>
        <!-- 右侧的滚动视图区域 -->
        <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
          <!-- 二级分类 -->
          <view class="left-scroll-view-item" v-for="(item2,index) in cate2List" :key="index">
            <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
            <!-- 三级分类 -->
            <view class="cate-lv3">
              <view class="cate-lv3-item" v-for="(item3,i) in item2.children" :key="i" @click="gotoGoodsList(item3)">
                <image :src="item3.cat_icon"></image>
                <text>{{item3.cat_name}}</text>
              </view>
            </view>
          </view>
        </scroll-view>
      </view>
    </view>
  </view>
</template>

<script>
  import badge from '@/components/tabBar-badge.js'
  export default {
    name: 'cate',
    mixins: [badge],
    data() {
      return {
        wh: 0,
        cateList: [], // 一级分类数据列表
        cate2List: [], //二级分类数据列表
        active: 0, //激活项
        scrollTop: 0 //滚动条位置
      };
    },
    onLoad() {
      // 获取当前系统的信息
      const sysInfo = uni.getSystemInfoSync()
      // 为 wh 窗口可用高度动态赋值
      this.wh = sysInfo.windowHeight - 50
      // console.log( this.wh)
      this.getCateList()
    },
    methods: {
      async getCateList() {
        // 发起请求
        const {
          data: res
        } = await uni.$http.get('/api/public/v1/categories')
        // 判断是否获取失败
        if (res.meta.status !== 200) return uni.$showMsg()
        // 转存数据
        this.cateList = res.message
        this.cate2List = this.cateList[0].children
        // console.log(this.cateList)
      },
      //点击分类的响应效果
      activechanged(i) {
        this.active = i
        this.cate2List = this.cateList[i].children
        this.scrollTop = this.scrollTop === 0 ? 1 : 0
      },
      // 跳转详情页
      gotoGoodsList(item) {
        console.log(item)
        uni.navigateTo({
          url: '/subpkg/goods_list/goods_list?id=' + item.cat_id
        })
      },
      //点击搜索栏
      handleClick() {
        // console.log('ok')
        uni.navigateTo({
          url: '/subpkg/search/search'
        })
      }

    }

  }
</script>

<style lang="scss">
  .scroll-view-container {
    display: flex;

    .left-scroll-view {
      width: 120px;

      .left-scroll-view-item {
        line-height: 60px;
        background-color: #f7f7f7;
        text-align: center;
        font-size: 12px;

        // 激活项的样式
        &.active {
          background-color: #ffffff;
          position: relative;

          // 渲染激活项左侧的红色指示边线
          &::before {
            content: ' ';
            display: block;
            width: 3px;
            height: 30px;
            background-color: #c00000;
            position: absolute;
            left: 0;
            top: 50%;
            transform: translateY(-50%);
          }
        }
      }
    }
  }

  .cate-lv2-title {
    font-size: 12px;
    text-align: center;
    font-weight: bold;
    padding: 15px 0;
  }

  .cate-lv3 {
    display: flex;
    flex-wrap: wrap;

    .cate-lv3-item {
      width: 33.33%;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      margin-bottom: 10px;

      image {
        width: 60px;
        height: 60px;
      }

      text {
        font-size: 12px;
      }
    }
  }
</style>
